T his thesis discusses whether there is a positive effect of buyer-supplier engagement and suppliers selection With Success of buyer-supplier relationships on finn performance. Data collected by distributing questionnaires to 104 respondents who were employees of PT Indonagatomi Elektroutama and PT Gunung Sagara Buana. In preparing the study design, researchers use a testing hypothesis. Technik semple making Judgement sampling is used. While analysis tools used to test the hypothesis is Structural Equation Modeling (SEM). Results of hypothesis test showed that there was a significant positive effect of buyer-supplier agreements and suppliers selection on the success of buyer-supplier relationships and there is also a significant positive effect of success of buye-supplier relationships on finn performance. For future research is suggested to do the research premises respondents from more than two such companies that currently researchers carefully.